S-91771A083 2-56 x 5/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional corrosion resistance with passivated 18-8 stainless steel, ideal for harsh environments and long-term reliability.
- High tensile strength of 80,000 PSI ensures secure fastening under demanding mechanical loads.
- Class 2A thread fit provides consistent, reliable engagement with standard UNC coarse threads for easy assembly.
- 82° countersink angle and flat head design allow for flush mounting, reducing snagging and improving aesthetics.
- Phillips drive (No. 1 size) offers efficient installation with common tools, minimizing slippage and damage.
- Full threading along the 5/8" length enhances grip and distribution of clamping force across applications.
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for industrial use.
Professional Applications & Engineering Value
These 2-56 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in machinery. Made from passivated 18-8 stainless steel, they resist rust and chemical exposure, making them ideal for applications in electronics, automotive assemblies, and outdoor equipment. The coarse UNC threads and Class 2A fit ensure quick, secure fastening even in materials prone to stripping, while the flat head with an 82° countersink provides a smooth, low-profile finish that prevents interference in tight spaces. With a tensile strength of 80,000 PSI and Rockwell B80 hardness, these screws maintain integrity under stress, reducing maintenance needs and downtime in industrial fastening systems.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse thread specifications, ensuring compatibility and ease of use. It meets ASME B18.6.3 for mechanical and dimensional requirements, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial applications.
